In the beginning of section II of the music resource guide, it states that a dundun is "an hourglass-shaped tension (or squeeze) drum." However, later in this section it describes a dundun as a "long cylinder-shaped double-headed bass drum".

My question is, which is it? Since last I checked a drum cannot be both cylindrical and hour-glassed shaped.

The only thing that I can think of, besides it simply being an error, is that a dundun refers to a different drums in different cultures, since the first mention of the dundun was in relation to Yoruba drumming traditions, whereas the second was in relation to the mande instruments.